deformers are red and do not work?
Dave

You have to add a 'Lattice' object as well as the object to deform (should be in the shift+a menu, 3D viewport), and point to this lattice from the lattice-modifier added to the object you want to deform...

Have a look at this- https://www.dropbox.com/s/4goj0kobrqmjbut/LatticeExample.blend?dl=0

Chose the sphere, and enable the 'lattice' modifier in the viewport (2nd in the top row of buttons in the modifier settings, in the 'spanner' modifiers tab), bingo!...